void recDecToBin(int n, char* result){
    char str[2];
    int ost;
    ost = n%2;
    if(n>0){
        recDecToBin(n/2, result);
        sprintf(str,"%d", ost);
        strcat(result, str);
    }
}


int main(){
    int n;
    char result[30]="";
    scanf("%d", &n);
    recDecToBin(n,result);
    puts(result);
    return 0;
}